I am running Windows 10 1903 and Thunderbird 68.8.The issue started with the previous version of Thunderbird.It will not display previously read messages in any folder.If I go to the folder properties and choose repair, then all the messages become visible.As soon as I go to another folder, and then come back to the original, I have to repair it again to make all message visible.I have uninstalled it and reinstalled it multiple times. As soon as I paste in the information from my back up profile, all folders load, but no messages are visible.Something is causing this but I can not find it. I have checked every setting and nothing is checked. I have tried to reset everything to defaults, no change.Does anyone have any suggestions for me?

I have uninstalled the current version.I cleaned all of the keys from the registry and restarted the computer.I installed version 60.9.1 since this is before the corruption occurred. I believe the client was on 68.4 when this issue occurred.The problem still exists.Only unread messages are visible unless I run the folder repair tool.As soon as I change focus, the messages disappear again.

I allowed the program to update and create a new profile, which it did under the appdata/roaming folder.This time, instead of copying the entire profile, I only copied the contents of the Mail folder.At this time, all messages are properly displaying.

To the developers, what could be in another folder that could be causing the messages to disappear?